Table of Contents
What is stadia method in surveying?
Definition of stadia : a surveying method for determination of distances and differences of elevation by means of a telescopic instrument having two horizontal lines through which the marks on a graduated rod are observed also : the instrument or rod.
How is a contour survey done?
In this method, the contours to be located are directly traced out in the ground by locating and making a number of points on each contour. These points are then surveyed and plotted on plan and the contours drawn through them.
What do stadia hairs measure?
Calvert (August 12, 2003). “The Stadia”. University of Denver. Archived from the original on 2013-05-20.
What is the purpose of stadia reading and how it is used?
a method of surveying in which distances are read by noting the interval on a graduated rod intercepted by two parallel cross hairs (stadia hairs, or stadia wires ) mounted in the telescope of a surveying instrument, the rod being placed at one end of the distance to be measured and the surveying instrument at the …
What does a contour report show?
In the most basic terms, a contour survey illustrates the elevation differences across your land, in regular intervals, from the lowest point to the highest point. Contour lines join points at the same elevation. The closer together the contour lines are, the steeper the section.
What is a contour survey plan?
Contour plans are a graphical representation of the lay of the land. They can be used to determine the extent of cut and fill needed, the height of retaining walls, and the overall finished height of buildings referenced back to natural ground level.
How accurate is stadia measurement?
For distances less than 150 m and using stadia or self-reduction methods, almost all investigators reported accuracy values in the range 1/600 – 1/2100, with elevations being determined to an accuracy ranging from ± 36 mm to ± 59 mm.
How is stadia distance calculated?
The distance between the instrument and a stadia rod can be determined simply by multiplying the measurement between the stadia hairs (known as the stadia interval) by 100.
How is stadia constant calculated?
The constant k = f/i is called the multiplying constant or stadia interval factor and the constant (f + d) =C is known as the additive constant of the tacheometer but the latter one is made zero by using an anallatic lens in the instrument.